ES2193963T3 - Procedimiento para fabricar eteres de celulosa con amarilleamiento y decoloracion reducidos. - Google Patents
Procedimiento para fabricar eteres de celulosa con amarilleamiento y decoloracion reducidos.Info
- Publication number
- ES2193963T3 ES2193963T3 ES00936349T ES00936349T ES2193963T3 ES 2193963 T3 ES2193963 T3 ES 2193963T3 ES 00936349 T ES00936349 T ES 00936349T ES 00936349 T ES00936349 T ES 00936349T ES 2193963 T3 ES2193963 T3 ES 2193963T3
- Authority
- ES
- Spain
- Prior art keywords
- cellulose ether
- molecular weight
- eteres
- decoloration
- cellulose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification
Abstract
Un procedimiento para preparar un éter de celulosa de bajo peso molecular, comprendiendo dicho procedimiento: (a) proporcionar un éter de celulosa de alto peso molecular de una viscosidad de aproximadamente 200 centipoises o más, en una solución acuosa al dos por ciento a 20oC; (b) poner en contacto el éter de celulosa de alto peso molecular con una cantidad de un ácido suficiente para despolimerizarlo parcialmente hasta un éter de celulosa de bajo peso molecular de una viscosidad de aproximadamente 100 cP o menor, a 20oC, en una solución acuosa al dos por ciento; (c) neutralizar parcial o sustancialmente el ácido por puesta en contacto del éter de celulosa de bajo peso molecular con un compuesto básico; (d) repetir las etapas (a)-(c) para producir dos o más tandas de producto discretas de éter de celulosa de bajo peso molecular, en las que al menos una tanda de producto discreta se neutraliza parcialmente a un pH de 6, 8 o menor; y (e) mezclar las dos o más tandas de producto discretas para formar una tanda de producto combinada de éter de celulosa de bajo peso molecular de un pH de 4 a 6, 8.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14104699P | 1999-06-24 | 1999-06-24 | |
US09/416,783 US6306333B1 (en) | 1999-06-24 | 1999-10-13 | Process for making cellulose ethers having reduced yellowing and discoloration |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2193963T3 true ES2193963T3 (es) | 2003-11-16 |
Family
ID=26838741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES00936349T Expired - Lifetime ES2193963T3 (es) | 1999-06-24 | 2000-05-26 | Procedimiento para fabricar eteres de celulosa con amarilleamiento y decoloracion reducidos. |
Country Status (11)
Country | Link |
---|---|
US (1) | US6306333B1 (es) |
EP (1) | EP1194452B1 (es) |
JP (1) | JP5236849B2 (es) |
KR (1) | KR100662225B1 (es) |
CN (1) | CN1146578C (es) |
AT (1) | ATE240974T1 (es) |
AU (1) | AU5167300A (es) |
DE (1) | DE60002871T2 (es) |
ES (1) | ES2193963T3 (es) |
MX (1) | MXPA01012909A (es) |
WO (1) | WO2001000680A1 (es) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6820570B2 (en) | 2001-08-15 | 2004-11-23 | Nobel Biocare Services Ag | Atomic layer deposition reactor |
US7172886B2 (en) * | 2001-12-06 | 2007-02-06 | The Regents Of The University Of California | Biosynthesis of isopentenyl pyrophosphate |
US20040142558A1 (en) | 2002-12-05 | 2004-07-22 | Granneman Ernst H. A. | Apparatus and method for atomic layer deposition on substrates |
US7601223B2 (en) | 2003-04-29 | 2009-10-13 | Asm International N.V. | Showerhead assembly and ALD methods |
US7537662B2 (en) | 2003-04-29 | 2009-05-26 | Asm International N.V. | Method and apparatus for depositing thin films on a surface |
JP2005187376A (ja) * | 2003-12-25 | 2005-07-14 | Shin Etsu Chem Co Ltd | 低置換度セルロースエーテル含有カプセル及びその製造方法 |
US8865432B2 (en) * | 2004-02-26 | 2014-10-21 | Shin-Etsu Chemical Co., Ltd. | Method for preparing cellulose derivatives having solubility improved |
EP1758938B1 (en) * | 2004-05-26 | 2019-05-15 | Dow Global Technologies LLC | Production of low molecular weight ethylcellulose |
KR101156365B1 (ko) * | 2005-08-12 | 2012-06-13 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 용해성이 개선된 셀룰로오스 유도체의 제조 방법 |
EP2032608B1 (en) * | 2006-06-14 | 2011-08-10 | Dow Global Technologies LLC | Process for reducing the average molecular weight of cellulose ethers |
KR101598009B1 (ko) * | 2007-11-09 | 2016-02-29 | 다우 글로벌 테크놀로지스 엘엘씨 | 셀룰로스 에테르 피복 조성물 및 방법 |
KR101586136B1 (ko) | 2013-01-09 | 2016-01-15 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 저중합도 셀룰로오스에테르의 제조 방법 및 이에 따라 제조된 셀룰로오스에테르 |
US9926385B2 (en) | 2013-08-12 | 2018-03-27 | Shin-Etsu Chemical Co., Ltd. | Method for producing water-soluble cellulose ether having low degree of polymerization and method for producing film coating composition comprising same |
KR102373750B1 (ko) * | 2016-10-06 | 2022-03-15 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 저중합도 셀룰로오스 에테르의 제조 방법 |
JP7267992B2 (ja) * | 2017-08-16 | 2023-05-02 | ニュートリション アンド バイオサイエンシズ ユーエスエー 1,リミティド ライアビリティ カンパニー | 低分子量セルロースエーテルの制御された調製方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4841037B1 (es) * | 1964-10-26 | 1973-12-04 | ||
JPS4830469B1 (es) * | 1969-09-04 | 1973-09-20 | ||
US4048433A (en) | 1976-02-02 | 1977-09-13 | The Procter & Gamble Company | Cellulose ethers having a low molecular weight and a high degree of methyl substitution |
US4061859A (en) * | 1976-06-14 | 1977-12-06 | The Dow Chemical Company | Viscosity reduction of cellulose derivatives |
JPS6225101A (ja) * | 1985-07-24 | 1987-02-03 | Shin Etsu Chem Co Ltd | 低重合度セルロ−スエ−テルの製造方法 |
US5476668A (en) * | 1990-08-24 | 1995-12-19 | Shin-Etsu Chemical Co., Ltd. | Base for film-coating pharmaceuticals and method for preparing same |
DE69129839T2 (de) * | 1990-08-24 | 1999-02-11 | Shinetsu Chemical Co | Beschichtungsbase für einen pharmazeutischen film und verfahren zur herstellung derselben |
JP3299744B2 (ja) * | 1991-05-31 | 2002-07-08 | アール・ピー・シエラー・テクノロジーズ・インコーポレイテッド | 薬剤セルロース・カプセルを製造する方法および装置 |
TR27111A (tr) * | 1992-06-06 | 1994-11-09 | Hoechst Ag | Sulfoakil grubu ihtiva eden alkilhidroksialkil selüloz eterleri. |
JP3522002B2 (ja) * | 1995-05-12 | 2004-04-26 | 信越化学工業株式会社 | 低重合度セルロースエーテルの製造方法 |
JPH1017701A (ja) * | 1996-07-05 | 1998-01-20 | Daicel Chem Ind Ltd | セルロース誘導体の分解方法 |
FR2757173A1 (fr) | 1996-12-17 | 1998-06-19 | Warner Lambert Co | Compositions polymeres d'origine non-animale pour la formation de films |
JP3212534B2 (ja) * | 1997-04-08 | 2001-09-25 | 信越化学工業株式会社 | 低置換度ヒドロキシプロピルセルロース粉末 |
-
1999
- 1999-10-13 US US09/416,783 patent/US6306333B1/en not_active Expired - Lifetime
-
2000
- 2000-05-26 ES ES00936349T patent/ES2193963T3/es not_active Expired - Lifetime
- 2000-05-26 WO PCT/US2000/014622 patent/WO2001000680A1/en active IP Right Grant
- 2000-05-26 DE DE60002871T patent/DE60002871T2/de not_active Expired - Lifetime
- 2000-05-26 JP JP2001506689A patent/JP5236849B2/ja not_active Expired - Lifetime
- 2000-05-26 EP EP00936349A patent/EP1194452B1/en not_active Expired - Lifetime
- 2000-05-26 AT AT00936349T patent/ATE240974T1/de not_active IP Right Cessation
- 2000-05-26 AU AU51673/00A patent/AU5167300A/en not_active Abandoned
- 2000-05-26 MX MXPA01012909A patent/MXPA01012909A/es unknown
- 2000-05-26 CN CNB008081654A patent/CN1146578C/zh not_active Expired - Lifetime
- 2000-05-26 KR KR1020017016602A patent/KR100662225B1/ko active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ATE240974T1 (de) | 2003-06-15 |
CN1353720A (zh) | 2002-06-12 |
WO2001000680A1 (en) | 2001-01-04 |
DE60002871T2 (de) | 2004-03-11 |
DE60002871D1 (de) | 2003-06-26 |
KR100662225B1 (ko) | 2007-01-02 |
MXPA01012909A (es) | 2002-07-30 |
EP1194452B1 (en) | 2003-05-21 |
KR20020016847A (ko) | 2002-03-06 |
US6306333B1 (en) | 2001-10-23 |
JP5236849B2 (ja) | 2013-07-17 |
CN1146578C (zh) | 2004-04-21 |
AU5167300A (en) | 2001-01-31 |
EP1194452A1 (en) | 2002-04-10 |
JP2003503557A (ja) | 2003-01-28 |
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